# Mac preview release build failed to load content in extension manager

**URL:** <https://discourse.slicer.org/t/mac-preview-release-build-failed-to-load-content-in-extension-manager/19899>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [September 28, 2021, 6:48pm UTC](https://discourse.slicer.org/t/mac-preview-release-build-failed-to-load-content-in-extension-manager/19899 "2021-09-28T18:48:23Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [September 28, 2021, 8:19pm UTC](https://discourse.slicer.org/t/mac-preview-release-build-failed-to-load-content-in-extension-manager/19899/2 "2021-09-28T20:19:49Z")

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This is the expected behavior. If you build Slicer then you also need to build all the extenions that you want to use to ensure ABI compatibility.

> [@Unable to access extensions with latest code - as of 21st Sept 2021](https://discourse.slicer.org/t/unable-to-access-extensions-with-latest-code-as-of-21st-sept-2021/19770/4):
>
> The extension manager only supports installing extensions for versions of Slicer corresponding to the revisions of Slicer Preview builds. The latest Slicer Preview 4.13.0-2021-09-18 is revision 30223, so extensions from the factory server are available for that version but not for the revisions of any commits from today. If you have your own Slicer that you’ve manually built, you are expected to manually build any extensions you need as well.

After you have build Slicer on your computer (which is not very easy), building the extensions is trivial, just two CMake commands - see [here](https://slicer.readthedocs.io/en/latest/developer_guide/extensions.html#build-test-and-package).

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